<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home'}">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary"
                     @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table :data="cateList"
                  :columns="columns"
                  :selection-type="false"
                  :expand-type="false"
                  show-index
                  index-text="#"
                  border>
        <template slot="isok"
                  slot-scope="scope">
          <i class="el-icon-success"
             v-if="scope.row.cat_deleted===false"
             style="color: lightgreen"></i>
          <i class="el-icon-error"
             v-else
             style="color: red"></i>
        </template>
        <template slot="order"
                  slot-scope="scope">
          <el-tag size="mini"
                  v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini"
                  type="success"
                  v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag size="mini"
                  type="warning"
                  v-else>三级</el-tag>
        </template>
        <template slot="opt">
          <el-button type="primary"
                     icon="el-icon-edit"
                     size="mini"></el-button>
          <el-button type="danger"
                     icon="el-icon-delete"
                     size="mini"></el-button>
        </template>
      </tree-table>
      <el-pagination @size-change="handleSizeChange"
                     @current-change="handleCurrentChange"
                     :current-page="queryInfo.pagenum"
                     :page-sizes="[3, 5, 10, 15]"
                     :page-size="queryInfo.pagesize"
                     layout="total, sizes, prev, pager, next, jumper"
                     :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类"
               :visible.sync="addCateDialogVisible"
               width="50%"
               @close="addCateDialogClosed">
      <el-form :model="addCateForm"
               ref="addCateFormRef"
               label-width="100px"
               :rules="addCateFormRules">
        <el-form-item label="分类名称"
                      prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader expand-trigger="hover"
                       :options="parentCateList"
                       :props="cascaderProps"
                       v-model="selectedKeys"
                       @change="parentCateChanged"></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // query term
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // data list of commodity classification, the default is empty
      cateList: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cate_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.message.error('获取商品列表失败')
      }
      console.log('goodsList')
      console.log(res.data)
      // 把数据列表，赋值给catelist
      this.cateList = res.data.result
      // 为总数据条数赋值
      this.total = res.data.total
    },
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.message.error('获取父级分类数据失败')
      }
      console.log(res.data)
      this.parentCateList = res.data
    },
    // 根据表单数据变化处理数据
    parentCateChanged () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cate_level = this.selectedKeys.length
        return 0
      }
      this.addCateForm.cat_pid = 0
      this.addCateForm.cate_level = 0
    },
    // 监听对话框关闭事件
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()

      this.selectedKeys = []
      this.addCateForm.cate_level = 0
      this.addCateForm.cat_pid = 0
    },
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return 0
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    }
  }

}
</script>

<style lang="less" scoped>
.zk-table {
  margin-top: 15px;
  font-size: 12px;
}
.el-cascader {
  width: 100%;
}
</style>
